Movable floors and bulkheads are becoming more common in aquatic facilities throughout North America. Although they offer similar benefits to an aquatic centre, there is a big difference between the two options.
Movable floors change the depth of the swimming pool water, while bulkheads act as a divider in the pool. Adding a movable floor and/or bulkhead will create endless opportunities for many different programs and activities within one body of water. Imagine the difference a movable floor or bulkhead could make in your swimming pool!
With a movable floor system the programming opportunities at your aquatic centre expand; traditionally you would need numerous bodies of water to offer these types of programming:
Swimming lessons (0.5M-1.2M)
Lane Swim (1.1M-1.35M)
Synchronized Swimming (2.0M-3.0M)
Water Polo (1.8M minimum)
Aqua Cycle (1.0M-1.2M)
Water Walking Programs (1.2M-1.5M)
Physical Rehabilitation (Beach entry or 0.5M-1.5M)
Competition Training (1.2M-1.5M)
The photo above shows the movable floor at the new Guildford Recreation Centre in Surrey, B.C where the water depth changes several times a day in order to accommodate various programs at the facility.
The addition of a bulkhead at your facility can allow you to accommodate many different programs and activities individually or simultaneously! Large, single activity pools can be divided easily to create separate swimming areas for:
Swimming lessons, fitness programs and other aquatic classes
Swimming competitions, water polo competitions and other sports events
Diving and synchronized swimming
Other special aquatic programs
The photo above shows the bulkhead installation in action at the Roosevelt Park Pool in Rapid City, South Dakota. The facility includes a 10-lane, 50M outdoor pool and when the Bulkhead is in the middle park position, the pool transforms into a 20-lane pool! This pool also features water polo courses for both men and women.
MAKE THE RIGHT CHOICE
When choosing a movable floor or bulkhead manufacturer, it is important to consider the following:
What is the installation time and complexity of the bulkhead/movable floor?
Is the operation of the bulkhead/movable floor easy and user-friendly?
Are the maintenance and service costs low?
Are the metal parts made of non-corrosive 316 stainless steel or special bronze?
Does the bulkhead/movable floor offer an aesthetically pleasing appearance?
Movable floors and bulkheads offer the ultimate aquatic versatility for your facility. The addition of a movable floor to a swimming pool can make it simultaneously a deep diving pool, a child friendly shallow depth pool or a mid-depth pool for exercise and water games. The addition of a bulkhead can transform a large single activity pool into separate swimming areas for classes, sports events, or special activities. Installing a movable floor or bulkhead will increase water usage and maximize the swimming pools potential. One pool with unlimited possibilities!
There are a lot of considerations when selecting a swimming pool contractor to build your pool. Whether the project is a high-end residential project or a multimillion dollar waterpark, it is important to be very diligent in selecting the builder to avoid delays, cost overruns, improper construction and lots of headaches. But what things should be considered?
WHAT DOES THEIR SAFETY RECORD LOOK LIKE?
The safety record of a company should be a primary consideration. A company with a poor safety record attracts a lot of attention (not the kind they want) and can really bog down a project. In fact, a project can be put on hold for an extended period if there are glaring safety infractions or heaven forbid a serious injury or fatality on the job site. Ask the proponent for a copy of their Health and Safety Policy, and safety record. If they don’t have one, or are unwilling to provide information, move on.
PRICE ISN'T EVERYTHING
Price, while always an important consideration is not everything. We frequently hear our clients say “…I wish we had gone with the more reputable builder. This job has become a nightmare…” The saying “you get what you pay for” could not be truer. If the price seems too good to be true, it is. There is no such thing as an extraordinary $7 bottle of wine, and there is no such thing as an inexpensive Bugatti car. The two things are mutually exclusive. The Bugatti and a K-car will both take you to the store, but the Bugatti will take you to the store for decades (and look really good doing it!), and there is no comparing the quality of the two. The same is true in pools. You can choose a method and a builder that may appear to save you a little coin but suffer endless change orders and additions to the project. Or you can spend that little extra bit of money to hire a thorough and reputable builder and have peace of mind for years to come.
DO THEY HAVE A STRONG FOUNDATION?
Like a strong building, a strong company needs a strong foundation. In the construction business, this foundation is in the form of knowledge that is both deep and wide, and can only be acquired from years of experience specific to the industry. A newer business just doesn’t have the history to be as knowledgeable as a well-established company that has been around for a long time. In the experienced company, there are senior people and younger members of the team. There is a combination of high energy and drive and a deep well of information that was developed over decades of practice. The thing about knowledge is that it is often applicable to a wide variety of applications that help experienced builders provide the best outcome for the client. Hydraulic concepts in pools and water management for example, are often applicable to electricity where Voltage equates to Feet of Head and current flow to velocity. Companies who have a deeper knowledge in their art have a broader understanding of the many things they may encounter in performing their work. Look for contractors who have a broad range of experience over a long period of time, senior people who have “been around the block” a couple of times and young energetic and well educated project people.
DO THEY HAVE INTERNAL SYSTEMS IN PLACE?
It is a great thing to have knowledge, but if it is held by a few individuals it often fails to crystalize in the positive outcome of your project. Good companies develop internal systems that reflect the Best Practices that have been developed out of the knowledge gained from experience. It is these companies who seek to establish a culture of quality and caring expressed in writing the form of standard operating procedures. Ask your potential contractor if they have internal systems in place to support quality assurance, delivery, and value added designs, longevity of the product, and so on. A company with systems is a company that cares about what they do, and who they do it for. Also ask if the company has a Mission Statement. The Mission Statement is the guiding philosophy of the company. A company without a mission is like a pilot without a map. Yes, the plane is flying…but the destination is dicey.
WHAT IS THEIR EXPERIENCE LEVEL?
The Record of Experience speaks volumes about the knowledge base of the company. Obviously, the more pools a company has built, the more experience they have. But it is also important to look at the different types of pools that a company has built. Not all pool builders build all pools, and sometimes for good reason. For example, Company ABC may be an advocate for cast-in-place pools through their limited knowledge and experience; they know how to build them, but nothing else. Concrete pools are really good and are considered the gold standard in the industry, however, there are times when another type of pool is more appropriate than a concrete pool. If the pool is going on the top floor of a high rise, weight may be a limiting parameter. It is important to find a builder who has the experience to recognize and understand your options and what best suits your needs. Ask your potential builders for their list of projects (current and complete) and also for a list of references. If the record of experience is small or limited in scope, you may want to look a little deeper into the company. If the reference list seems small compared to the record of experience, it should raise a red flag! A good contractor doesn’t maintain a specific reference list…every single client should be a reference.
DO THEY USE THEIR OWN FORCES?
If the builder you are looking at using has a lot of subcontractors, it may be worth looking a little further. Dividing the scope into different trade subcontracts (mechanical subs, waterproofing, tile, concrete etc.) dilutes and displaces responsibility of the trades and of the general contractor. When something goes wrong, it’s nobody’s fault, and it’s everyone’s fault. A great deal of time is spent trying to figure out if the waterproofing contractor caused the leak, or if the tile contractor damaged the waterproofing. Or maybe the concrete contractor is at fault. It is best to source a contractor who self-performs the entire pool scope with their own forces from the excavation, to mechanical and electrical work, to tile setting and commissioning and training. When there is only one company performing the entire scope for the work, there is no opportunity to cast blame for problems to others. You only have one phone call to make.
ARE THEY FINANCIALLY STABLE?
The financial stability of the company is also an important consideration. Are they able to completely bond a large project? Often tender documents ensure that this is the case, but private projects may overlook the need. What happens if things go wrong, or the contractor walks off the job or goes bankrupt? Who will finish the job? Who will pay for the work? Also, you want to be sure that the company you select is going to be around tomorrow and for years to come. Of course, there is never a guaranty but the best predictor of the future, is a record of the past. If the company has been building great pools for decades, they are likely to be around for a long time to come.
DO THEY HAVE A SERVICE DEPARTMENT?
Once the pool is built, you are away to the races. But what if something goes wrong with the pool after a few years? Who will close the pool for winter? It is always best of the company you choose to build the pool also has a service department who can deal with any problems and to perform regular maintenance. The service department of the company who built the pool is best equipped to service the pool since they will have an intimate knowledge of the pool from the construction phase. There are many “pool builders” out there who actually have no idea how to best operate a pool, and have no service department. It is best to steer clear of these builders. Once the project is complete, you never see them again.
CAN THEY PERFORM?
Finally, schedule can be critical, especially for commercial projects. Liquidated damages can cripple a business that was counting on opening the pool in December, but it didn’t happen until the following May. There has been more than a few projects abandoned or sold for pennies on the dollar as poor performing contractors drove the owner into insolvency. No builder is perfect or immune to making mistakes…things happen. What sets the premium builder apart from others is how they react to the problems. The only way to know how different builders react is to speak with their past clients. Don’t accept a short list of “preferred references”. It is a lot of work to fully research your builder, but it will pay dividends many times over in the long run.
A well-constructed pool delivered on time and on budget will provide decades of enjoyment, or in the case of a commercial project, revenue generation. The best start to this positive outcome is to balance all of these considerations discussed, and make a good decision.
Following construction, the commissioning of the pool system is critical to ensure that it is working properly and as it was designed, before handing over the operation of the pool to its Owner. These are the people who will be operating and maintaining their body of water on a daily basis.
During commissioning, all pieces of equipment are started-up, run, and programmed. I have learned first-hand how important it is to allow for the proper amount of time for this to occur. Allowing a few weeks to complete the commissioning ensures that each piece of equipment has enough time to operate as designed. If anything goes wrong it can be rectified immediately.
The set-up of the system begins when the water is introduced into the pool. Once the water starts to run through the piping, it is also running through each piece of equipment that is required to operate the system. Here are a few examples of equipment that requires set up;
The chemical controller, which monitors and reads the pools chemistry, requires some initial set up. The controllers parameters are set to ensure that if the chemistry is not within those parameters, the controller alarms to alert the operator that the water chemistry requires attention. This can take time to complete to ensure accuracy.
After the pump is started up, it should be allowed to run for a period of time to ensure that there are no leaks. Seals in a pump can be dry and cracked before the pump is even installed. You won’t be able to physically see this issue until the water is running through the system.
Those are just two examples of the numerous pieces of equipment that are involved in pool systems, most of which require set up. There is always a possibility that equipment can fail, so ensuring everything is commissioned by the time the system is fully operational means less chance of equipment or system failure. When there is a failure after the pool is fully operational, it could mean that the pool would have to be shut down and closed to its patrons. This is something that all Owners want to avoid at all costs.
Once the pool is completely commissioned, it is now the perfect time to train those individuals who will be operating the pool on a daily basis. Every pool system is different, so even if a person has experience with pool systems, the new system could be slightly different. A controller could be updated from the previous version, or the system could include a UV system that the Operator has no previous experience with.
Training sessions cover many techniques including:
How the piping system flows
How to operate the controller
Understanding what can go wrong
What to do if the pool overflows
How to adjust chemistry of the pool
What to do if the system equipment is in alarm
Allowing those people the opportunity to watch and learn through a hands-on training session has amazing benefits for them in the future operation of the pool. When Operators have the understanding and knowledge that they need, their confidence level is increased, allowing them to maintain the system properly, and promptly deal with any issues that may arise, shortening their down time.
As you can see, commissioning and training benefits all parties involved in the operation of the pool system. The time for this to occur should be considered in every construction schedule.
As temperatures cool and holiday season’s approach, most of our fitness progress made in the warmer summer months is replaced throughout the fall and winter with growing regret. Whether it's due to the cooler weather, the loss of convenient outdoor exercise or our weakness for delightful holiday foods, throughout the cooler months of the year we would prefer to stay at home, cocooned in a blanket with a piece of pie and a TV series to binge watch than take on the cold and head to a gym. Unfortunately, this change of behaviour can lead to a decline in our overall health.
HEART WORK PAYS OFF
An energy surplus (when you consume more energy than you burn) which can lead to many different health issues including insulin resistance – the very first step to diabetes, and other serious metabolic problems. Committing 30 minutes of physical activity daily can go a long way.
Exercising doesn’t need to be a chore. In fact, many of the activities we enjoy during the summer can now be found indoors as well. Many gyms have tracks and treadmills for those who prefer walking and jogging, bikes, basketball courts and for one of the most effective forms of exercise, swimming pools!
SWIM FOR YOUR LIFE
Swimming is a low impact activity that is mentally and physically beneficial. Unlike many other forms of physical activity, swimming is both cardiovascular and strengthening at the same time. Although swimming is easy on the body, it makes use of all major muscle groups including shoulders, back, abdominals, legs, hips, and glutes. Here is a list of some of the incredible health benefits swimming can offer throughout the entire year.
Aquatic exercise has been found to improve cardiac function in mild to moderate chronic heart failure.
Swimming provides a total body workout, as nearly all of your muscles are used during swimming, which can help lower blood pressure, improve cholesterol, and strengthen your heart – all factors which help to reduce the risk of cardiovascular disease.
Swimming has been recognized as one of the most effective calorie burners. Regular aquatic exercise can help maintain a healthy weight, healthy heart and lungs.
Swimming reduces the impact on your body, while still providing a complete body workout making aquatic exercise more beneficial to individuals suffering from obesity and osteoarthritis than forms of land based exercise.
Swimming and aquatic exercise increase’s muscle strength, flexibility, and endurance.
Aquatic exercise has been shown to improve respiratory function, and provides an opportunity for individuals with asthma to work out in a moist air environment, reducing exercise induced asthma symptoms and improving asthma overall.
Regular aquatic exercise reduces the risk of diabetes by controlling blood sugar and lowering body weight.
Exercise is extremely important for individuals with diabetes in order to increase insulin action and keeps blood sugars at a healthy level. Due to the buoyancy of the water, swimming does not put pressure on joints and eases the stress on the body, including feet making swimming ideal for people with diabetes.
Swimming can evoke relaxation, alleviate stress and improve overall mental health. The stress relieving benefits of swimming are comparable to those found in yoga.
Swimming improves coordination, balance and posture and improves the quality and quantity of movement for those suffering from joint pain.
As swimmers, swimming pool operators, or facility owners, we are subjected to countless myths and legends that have been floating around the aquatic community for years. These wives tales can lead to misunderstandings, and for operators, can lead to the improper care of your swimming pool. It is important to be aware of the myths, lies, and assumptions, as well as understanding the truths in order to do our part in maintaining a comfortable swimming environment for all. Here’s a list of some of the top 3 myths affecting swimmers, and operators!
"CHLORINE WILL TURN MY HAIR GREEN!"
Although believed to be the causing factor by many, chlorine is not responsible for hair discolouring. If a swimming pool has caused your hair to turn green, it is likely due to the presence of copper in the water. Metal plumbing or algaecide can cause copper to reside in the pool water.
"CHLORINE MAKES MY EYES RED AND SORE!"
We have all experienced irritated eyes and skin after swimming, and likely we have all deduced that our eyes sting and our skin is dry because there was too much chlorine in the swimming pool. Unfortunately, we have been misguided.
Swimmer “red eye” is actually caused by chloramines which are formed when nitrogen (found in urine and sweat) is combined with chlorine. These chloramines are to blame for irritating our eyes, skin and even our respiratory systems. In fact, if these chloramines exist, operators may very well need to add MORE chlorine to the pool water in order to reduce the formation of chloramines. If the pH is too low or too high, swimmers may also feel some discomfort and irritation. Human tear ducts have a pH of 7.5, which means operators must ensure the pH remains between 7.4 and 7.6 and the combined chlorine stays at 0.2ppm or below in order to maintain a comfortable swimming environment.
"THE POOL MUST BE CLEAN BECAUSE I CAN SMELL THE CHLORINE!"
When you walk into an aquatic centre and you smell the strong scent of chlorine, our automatic response is to assume it must mean the pool is clean! Maybe we relate it to the smells of cleaning chemicals, but whatever the reason, this idea is wrong. It is actually the opposite; a properly cleaned swimming pool should not smell like a chemical factory. The strong smell that we have all experienced so many times is really due to chloramines – the result of a reaction caused by the mixing of chlorine and contaminants carried into the water by swimmers.
These contaminants can include but are not limited to:
A strong smelling swimming pool can indicate that the chlorine is working harder than necessary, due to the presence of contaminants in the pool and may really mean that the pool is in need of further chemical intervention.
Swimming pools are an excellent way to stay active and have fun in the summer, but if you live or operate a swimming pool in a colder climate, there comes a time at the end of the swimming season when pools must be winterized. Not winterizing a pool in a colder climate is simply not an option, unless you want a hefty repair bill come spring.
The power of water when it freezes and thaws is absolutely amazing. In colder climates, like Canada for instance, pools that are not properly winterized will experience all kinds of damage, such as cracked and broken pipes, pumps and filters.
In addition to winterizing the entire mechanical system for the pool, the pool shell itself requires protection against frost. The simplest way to protect a pool shell is to leave it full of water for the winter. When filling the pool for a winter hibernation, care should be taken to allow room for the water to rise with rain and snow. Typically the water level in a pool is left 12-18" from normal operating level at the time of winterizing.
To complete the winterizing, the pool should be completely drained, and compressed air used to blow out water from the recirculation piping. All returns, water inlets, drains, etc. need to be capped or plugged to keep water out. Play features in pools also need to have all the water removed from them and in some cases some water features will need to have antifreeze introduced into them to prevent low lying fittings from collecting water and freezing. Items such as skimmers should also have expansion devices installed to prevent these items from damage due to freezing expansion. Once all of the piping has been cleared of water and properly sealed up, the pool shell can then be filled and chemicals added. Items such as pumps, filters and heaters in the mechanical room also need to have all drain ports opened up and drain plugs removed.
When winterizing a pool, it is imperative that the time is taken to do it properly, in order to avoid any future damage and additional repair costs to the facility. Taking the proper steps can not only help preserve the condition of the pool tank and the mechanical equipement, but these simple steps can also help increase the longevity of the grounds, building, and deck equipment. Here are some tips to closing a swimming pool, recommended by the National Swimming Pool Foundation.
Adjust the chemical balance of the pool water to the recommended levels.
Treat Facility water with appropriate products to minimize algae, bacteria, or damage to surfaces.
Clean and vacuum the pool.
Empty and store skimmer baskets and hair and lint traps for the winter.
Backwash the filter thoroughly and clean the filter media or elements.
Drain sand filters. Remove cartridges or D.E. filter elements, inspect for tears or excessive wear, and store.
Lower the water level to below the skimmers and return lines for plaster pools. If needed, remove the remaining water from the recirculation lines using an air compressor or industrial type tank vacuum cleaner.
Open all pump room valves and loosen the lid from the hair and lint skimmer. However, if the filter is below pool water level, close the valves leading from the pool to the filter.
Grease all plugs and threads.
Add antifreeze formulated specifically for recreational water applications to the pipes to prevent bursting. Do not use automotive antifreeze.
Plug the skimmer or gutter lines. Winterize with antifreeze and expansion blocks. Secure the skimmer lids to the deck to prevent their loss. Plug wall return lines and the main drain.
Make sure the hydrostatic relief valve is operational.
Drain and protect pumps. If a pump and motor will be exposed to sever weather, disconnect, lubricate, perform seasonal maintenance of the pump, and store. Add antifreeze to help protect pumps and seals from any residual water left after draining.
Clean surge pits or balancing tanks.
Disconnect all fuses and open circuit breakers.
If underwater wet niche lights are exposed to the elements, remove them from their niches and lower them to the bottom of the pool.
Drain the pool water heater. Grease the drain plugs and store for the winter.
Turn off the heater gas supply, gas valves, and pilot lights.
Install the winter safety cover.
Properly store any unused chemicals as described on their labels to prevent containers from breaking and the mixing of potentially incompatible chemicals. Dispose of test reagents, disinfectants, and other chemicals that will lose their potency over the winter.
Disconnect, clean and store the chemical feeder, (Remember - Only Water can be used to clean out the chemical feeders) controllers, and other chemical feed pumps. Store controller electrodes in liquid and in a warm environment.
Clean and protect pressure gauges, flow meters, thermometers and humidity meters.
Store all deck furniture (chairs, lounges, tables, umbrellas, etc.) Identify and separate all furniture in need of repair.
Remove deck equipment, hardware, and non-permanent objects such as ladders, rails, slides, guard chairs, starting blocks, drinking fountains, handicapped lifts, portable ramps, clocks, weird, and safety equipment to prevent vandalism. Store in a clearly marked, identifiable, weather-protected location. Cap all exposed deck sockets.
Remove the diving boards. Store the boards indoors, upside down and flat so they will not warp.
Turn off the water supply to restroom showers, sinks, and toilets. Drain the pipes and add antifreeze.
Remove shower heads and drinking fountain handles. Open hose bibs and fill spouts.
Inventory all supplies and equipment. Make suggestions for preventative maintenance and repair, upgrading, and needed equipment purchases.
** ALL COMMERCIAL POOLS ARE DIFFERENT – ENSURE YOUR PERSONAL CLOSING PROCEDURES FOR YOUR POOL PRIOR TO COMMENCING WORK.
Pool water filtration is one of the most important aspects of a swimming pool. For obvious reasons, it is imperative that the water be clean and clear. Swimmers and lifeguards require this crystal clear water for several reasons, whether it be for swimming laps, knowing when to start a flip turn, or being able to see all of the pool patrons clearly in order to effectively monitor the pool. Furthermore, the water needs to be clean and free of bacteria so that swimmers do not leave with an illness. While there are many systems that work in conjunction with a pool filter to help keep the water healthy, the physical pool filter, which is available in varying styles and options, is the focal point in providing clean, clear water.
In most cases, pool water is pushed by the filtration pump through the filter system. Other systems operate using the pump on the other end of the system where it can pull the pool water through the filtering system. Either way, what happens is essentially the same – as water passes through the filter media, physical dirt and bacteria are removed, and clean water continues from the filter through the remainder of the recirculation system for further treatment, and returned to the pool.
The style of filter, along with the media being used, will determine the effectivness of the filtration system, as differing types of filter media actually filter different sizes of particles out of the water.
#20 SILICA SAND
The reason that pool filters use #20 silica sand (also known as 20 grit or 20 grain, 0.45-0.55 mm sized granules) is that it is small enough to filter out micro bacteria, yet large enough that it doesn’t get pushed through the whole plumbing system and cause other problems. In addition, larger granules are unable to filter the small bits of dirt and bacteria that it is intended to. #20 silica sand can filter out particles down to 20-40 microns in size. As water passes through the sand (which is essentially a really small stone, which is jagged on all edges if looked at through a microscope), the jagged edges catch tiny dirt and bacteria particles, eliminating them from the pool environment.
Depending on various factors (bather load, bather cleanliness, etc.) sand filters need to be backwashed every so often to clean the sand. If the sand filter is not maintained, it will stop filtering as it is supposed to. Backwashing is completed by running water through the system backwards to release all of the dirt and bacteria that has been caught by the sand, and must then be removed from the filter tank. When the water being discharged is clear, you are finished backwashing. Most filters have a sight glass so operators can physically see the dirty water at the beginning of backwashing eventually turn clear when the process is done.
Sand is the oldest and most commonly used filtration media, because it is effective and one of the most cost friendly options. However, after many cycles of filtering and backwashing, the granules become rounded, eliminating their filtering capabilities. The sand should be changed approximately every 5 years, depending on usage and backwashing frequency.
Zeolite is an all-natural product that is gaining popularity in the pool industry. It is about half as dense as #20 sand, meaning you can use about half as much as what is recommended for the filter. For example, if your filter requires 100 lbs. of sand, you would only require about 50 lbs. of zeolite. This type of filtration media is a bit more expensive than sand, so there will be a higher upfront cost. With the ability to filter particles down to 5 microns, Zeolite is comparable to a D.E. filter, and better than sand, though D.E. filtration systems are much more expensive than a sand filter system charged with a zeolite media. Zeolite lasts about the same amount of time as sand with regular use, which is approximately 5 years.
Crushed glass is a new addition to the filter media family. Made from recycled glass (good for the environment) that is crushed to the same size as #20 sand, it filters using the same principles as sand. In comparision to sand, crush glass lasts longer (approximately 10 years) and can help in removing micro particles with its negative charge. When using crushed glass, more of the filter media is used for filtering because it utilizes more of the filter tank, as opposed to sand which typically only uses the top four to six inches. This means there is a shorter backwash time, saving more precious water.
DIATOMACEOUS EARTH (D.E.)
Diatomaceous Earth (D.E.) filters the water very effectively, down to two to six microns, however they are more expensive systems and take up a larger footprint in the mechanical room. D.E. is tiny fossilized skeletons of sea plankton that are coated onto a grid of filter elements that sit in a tank where the pool water passes through. The water can either be pushed or pulled through this system. D.E. is considered carcinogenic, and proper handling and storage techniques, including protective gear and breathing protection, must be adhered to. D.E. filters are able to be backwashed for cleaning, but the media is lost in the process, and needs to be periodically replaced. D.E. systems do not eliminate chloramines which cause the chlorine smell commonly noticed at an indoor pool, so using a UV system is strongly recommended in order to eliminate them (a reccommendation for all pool filters).
Regenerative filters are another new option in the pool market. They also utilize D.E. or a synthetic substitute, however are a bit more complex in their design. In a traditional D.E. filter, only the channels and depressions of the surface of the filter media trap particles. The underside of the D.E., the side attached to the grid, has a reduced ability to filter. In a regenerative filter, the media is held on multiple tubes, or “fingers”, that are periodically “bumped”, causing the filter media to fall to the bottom of the tank. The filter media is then redistributed, allowing unused sides of the media to be used for filtration as well. Regenerative filters offer a large amount of surface area with a relatively small footprint and are often toted for their water saving qualities due to the reduced need for backwashing and D.E. replacement. The water savings may or may not offset the cost of these units, therefore your individual return on investment should be evaluated before purchase.
Thanks to several innovations and advancements in technology, there are many options available when considering pool filters, and filtration media. It is important to consider all of the factors specific to your project when choosing a filtration system, or to at least understand what you want and don’t want when planning with the pool designer that is working on your project. You want to have the right filtration system and media for the facility to ensure it is operating in the most economical way.
Every year people die by electrocution, and some of these incidents are associated with pools. In fact, In September 2016, a young girl working as a lifeguard at a swimming pool in North Carolina lost her life when she was electrocuted as she entered the water. So let’s talk a little bit about this, and how we might reduce the risk of electrical injury associated with pools.
Electrical energy acts a lot like other sources of energy in that it moves (flows) from one area to another when there is a “potential difference” in the voltage of those areas. Like a waterfall plummeting from a high point to a low point, so does electricity from a higher voltage (a live wire or battery terminal for example) to a lower voltage (ground).
Electricity generally speaking, needs a “conductor” to move or "flow" through. This flow of electricity is expressed in terms of Amperes or Amps. Some things are better conductors than others. Copper, aluminum and gold are excellent conductors and pass electricity, while things like the human body are less apt as conductors, but can certainly still pass electricity. Other substances like some (but not all) polymers and glass are insulators. Still others are classified as semiconductors (like doped / contaminated silicon). Uncontaminated water is actually an insulator when pure (distilled), but becomes sort of a semiconductor most of the time. In pools, it is usually a pretty fair conductor having been “contaminated” with minerals, chlorine and sometimes salt. The human body is a mediocre conductor, but also a poor insulator. Being that we are largely made up of contaminated water, electricity from a source will pass through our bodies on the way to ground…the lower voltage. On the way through it can interfere with nerve impulses including those activating the heart, and cause damage, seizure or in the worst case death by cardiac arrest.
So how can we make the seemingly unsuitable bed partners of pools and electricity less…shocking?
BONDING AND GROUNDING
Bonding refers to bringing all of the conductors around the pool (the reinforcing steel, handrails, light fixtures, pump cases etc.) to the same electrical potential by connecting them all together with a conductor (a ground wire). This eliminates the possibility of any potential difference between these various items; whatever voltage one item is at, the same voltage will be seen at all of the other items. But bonding alone does not render the items safe. You can’t get a shock between one item and another, but what if a stray voltage is energizing the bonding wire to some higher voltage? Then any of the items could give you a shock if your body is grounded (for example, being barefoot on the deck). To ensure the items are a zero volts, the bonded items have to be grounded. This simply involves running a wire from the bonded loop to the ground lug in the distribution panel.
KEEP ELECTRICAL ITEMS AWAY FROM THE POOL
It is never a good idea to have an electrically powered item near a swimming pool. Things like radios, blenders (for those summer margaritas) if dropped into the pool, can electrically charge the water and potentially shock bathers. Even if the device is away from the pool on the deck somewhere, someone who has recently been in the pool could drip water into the device and create a conductive path with the water from the device, through them to ground…not fun!
USE GFCI DEVICES AND BREAKERS
Ground Fault Circuit Interrupting (GFCI) devices work by comparing the current flow in the hot (supply) wire to the current flow in the neutral (return to ground) wire. In any circuit, the current flow should be the same in both ‘legs’. If it isn’t, it means the current is going somewhere else - like through you! The GFCI device will trip to disconnect the power supply if there is a difference of 6mA (that’s 6/1000 Amps), and does so in a fraction of a second to protect us from being shocked. GFCI devices are a great way to protect people from any electrical device, but are particularly appropriate for things like underwater pool lights where electricity is so close to the water.
PERFORM REGULAR ELECTRICAL REVIEWS
It’s a fact of life on this planet of ours that things change, materials degrade, corrode, erode, oxidize and just plain wear out. Your electrical system is no exception. Electrical distribution boxes and the breakers within become corroded and fail. Plastic wire insulation dries out and cracks, ground points become corroded. Corrosion is exacerbated by exposure to salt water because of its electrolytic properties. Having a reputable electrical contractor visit the site periodically may flag some of these issues before they become a health and safety concern. In addition to a visual inspection, they can perform tests (like high voltage meggering) to assess the condition of various electrical insulators in the system.
Heat Loss Prevention: Solar Blankets or Liquid Pool Covers?
Wednesday, July 11, 2018
When I think about heating an outdoor swimming pool, the first method that comes to mind is a solar blanket, or solid cover. Usually, this means a large blue bubble wrap sheet that covers the entire surface of your pool, and is stored on a reel when the pool is in use. However, did you know there is another option to help keep the heat in your pool? Let’s take a look at two of the most common, but different options.
A solar blanket retains heat, and radiates the heat to the pool water when the sun is shining. When purchasing a solar blanket, you have several options you can choose from including, but not limited to size, shape, colour, density, and type of material. With the array of sizes and shapes, there will always be something that will fit your pool almost perfectly or, in some cases, after a little trimming. All colour options are equally effective, so the choice of colour is ultimately based on the pool owner’s preference. The density of the cover will usually determine the life expectancy of the cover.
Solar blankets can help protect your pool water from debris that could blow in on a windy day; however, solar blankets can also become a breeding ground for algae if left on for too long in the heat and humidity. Below, are a list of some of the advantages and disadvantages of solar blanket heating options.
Solar blankets have an insulating quality (provided by the air pockets that make them up) that liquid covers do not.
Can help prevent some debris from entering the pool
Solar Blankets don’t last long. After approximately 3 seasons, the blanket will need to be replaced.
Labour intensive (If you do not have a reel for your solar blanket, you need two sets of hands to lift and fold the blanket before and after pool use)
Solar blankets are not aesthetically pleasing.
They can be very dangerous if trapped underneath.
Not environmentally friendly. Did you know you can make tens of thousands of sandwich bags from the material used in a solar blanket? Process to manufacture uses oil to produce the plastic.
Although a solar blanket will prevent some debris from entering the pool, most of it ends up in the pool when you take the cover off.
LIQUID POOL COVERS
Liquid covers reduce heat loss in your swimming pool by reducing evaporation of water from the surface. There are a number of liquid pool covers currently on the market by many different manufacturers. However, one thing that seems to be consistent throughout the market is the environmentally friendly factor. Liquid pool covers are usually biodegradable and made with an alcohol based product, which won’t harm your pools chemistry when used in the correct dosage. Most importantly, liquid pool covers are safe for your family, and even your four legged friends!
The ingredients used to form a liquid pool cover are not the only safety feature. When considering safety, liquid pool covers are by far the safer option in comparison to a solar blanket. If you have children or pets and use a solar blanket, there is a potential risk of entrapment. Once submerged, a solar blanket can be difficult to escape for people and animals of all sizes. A liquid pol covers invisible film is impossible for something or someone to get caught underneath, eliminating the risk of entrapment entirely.
When taking operation into account, liquid pool covers have their disadvantages as well. Since the liquid is a thin layer, it can be disturbed by movement in the water and from wind. The liquid pool cover will only resume its total pool coverage once the water movement has stopped.
The convenience of a liquid pool cover is another benefit. There is no labour required to use this product. On top of that, how many times have you thought to yourself, “I’d like to go for a swim”, only to realize that your solar blanket is on and to go swimming, you not only have to find another set of hands, but you also have to remove it? Sometimes, going for a swim isn’t really worth the effort. A huge benefit of a liquid pool cover is the immediacy. Do you want to swim right now? Great! With a liquid pool cover all it takes is a big jump and you are swimming, without the worry of lugging that large wet plastic tarp off of your pool. Below, are a list of some of the advantages and disadvantages of liquid pool covers.
The danger of entrapment is eliminated with the use of a liquid pool cover
There is no labour requirement
No need to worry about replacement covers
Very aesthetically pleasing. The cover is completely transparent, and invisible to the naked eye. Swimmers won’t even know it is being used.
Environmentally friendly and biodegradable
Must purchase the product
Not suitable for disturbed water
Will not stop debris from entering the pool
Solar blankets and liquid pool covers both have their benefits, but they also have their downfalls. They are both effective at preventing heat loss from your pool, however, there are some differences. After considering all of the factors for each option, and weighing them against some of your needs you can determine the benefits you value the most, which in the end, will help you make a decision.
There is nothing more appealing than the thought of jumping into a swimming pool or lake on a hot summer’s day! There are so many benefits to swimming at any time of the year, but it particularly brings an extra layer of enjoyment on hot summer days. Along with talking about all the benefits of swimming, it's very important that we also discuss water safety.
According to the CDC (Centers for Disease Control & Prevention), drowning is a leading cause of unintentional injury death worldwide, and the highest rates are among children. Three children die every day from drowning, the leading cause of injury death among children aged 1–4 years. Drowning is not only a risk in swimming pools and lake’s, but it's important for people to understand that children are susceptible to drowning in as little as one inch of water.
The most important thing to understand about drowning is that it does not resemble what you see in the movies (arms flailing, splashing, or screaming). In reality, drowning is completely silent. The warning signs of drowning may include:
Someone who is drowning remains upright in the water and is not kicking and not able to wave or call for help
Someone may appear to be climbing an invisible ladder
Hair may be over their eyes and or forehead
Eyes are glassy and unable to focus
Head may be low in the water and tilted back with mouth open
Someone is looking towards the pool deck, sky, or shore and appear in shock
If a child goes silent something might be wrong
While these statistics are alarming there are a number of ways to prevent drowning.
LEARN LIFE SAVING SKILLS
Swimming lessons are very important and the first step to having safe water fun! Everyone should know the basics of swimming and take the extra step to be trained in CPR and First Aid. Many municipalities and YMCA’s offer swimming lessons at a very reasonable price. There are also many free or subsidized learn to swim programs that may be available in your area.
FENCE IT OFF
If you have a backyard swimming pool it is recommended that you have a separate fence just for the pool area (separate from the house and other yard space). In some States this is a requirement for backyard pools, but even where it's not a requirement it's highly recommended. This prevents someone from accidently accessing the area when the pool is not in use. If a fence is not an option, there are other things available on the market, like alarms which can be installed on the doors going out to the swimming pool or on the pool itself.
MAKE LIFE JACKETS A MUST
Children, inexperienced swimmers and boaters should wear life jackets in and around bodies of water.
BE ON THE LOOK OUT
When kids or weak swimmers are in or near water, they should be closely supervised by a confident swimmer. Adults watching kids in or near water should avoid all distractions like reading, surfing the web, answering the phone, playing cards, and drinking alcohol. It is always wise to designate a “water watcher,” someone who is specifically responsible for watching the kids in the water.
Swimming is a fun and safe activity for all ages when everyone does their due diligence with these water safety practices! These tips are just a few of many to keep people safe during the summer season and while enjoying the water all year round!